mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-16 14:51:51 -04:00
6094ea64c6
The DMA iterator logic was mixed into verbs and umem-specific code, forcing all users to include rdma/ib_umem.h. Move the block iterator logic into iter.c and rdma/iter.h so that rdma/ib_umem.h and rdma/ib_verbs.h can be separated in a follow-up patch. Link: https://patch.msgid.link/20260213-refactor-umem-v1-1-f3be85847922@nvidia.com Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
|
|
/* Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. */
|
|
|
|
#include <linux/export.h>
|
|
#include <rdma/iter.h>
|
|
|
|
void __rdma_block_iter_start(struct ib_block_iter *biter,
|
|
struct scatterlist *sglist, unsigned int nents,
|
|
unsigned long pgsz)
|
|
{
|
|
memset(biter, 0, sizeof(struct ib_block_iter));
|
|
biter->__sg = sglist;
|
|
biter->__sg_nents = nents;
|
|
|
|
/* Driver provides best block size to use */
|
|
biter->__pg_bit = __fls(pgsz);
|
|
}
|
|
EXPORT_SYMBOL(__rdma_block_iter_start);
|
|
|
|
bool __rdma_block_iter_next(struct ib_block_iter *biter)
|
|
{
|
|
unsigned int block_offset;
|
|
unsigned int delta;
|
|
|
|
if (!biter->__sg_nents || !biter->__sg)
|
|
return false;
|
|
|
|
biter->__dma_addr = sg_dma_address(biter->__sg) + biter->__sg_advance;
|
|
block_offset = biter->__dma_addr & (BIT_ULL(biter->__pg_bit) - 1);
|
|
delta = BIT_ULL(biter->__pg_bit) - block_offset;
|
|
|
|
while (biter->__sg_nents && biter->__sg &&
|
|
sg_dma_len(biter->__sg) - biter->__sg_advance <= delta) {
|
|
delta -= sg_dma_len(biter->__sg) - biter->__sg_advance;
|
|
biter->__sg_advance = 0;
|
|
biter->__sg = sg_next(biter->__sg);
|
|
biter->__sg_nents--;
|
|
}
|
|
biter->__sg_advance += delta;
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(__rdma_block_iter_next);
|